[1448] Thus 5496 lb. of the washed root afforded of dry only 1277 lb., or 23·2 per cent.—Information communicated by Messrs. Allen and Hanburys, London.
[1449] For further particulars about them, see Vogl, Sitzungsber. der Wiener Akademie, vi. (1863) 668 with plate; Hanstein, Milchsaftgefässe und verwandte Organe der Rinde, Berlin, 1864. 72. 73. pl. ix.
[1450] The reader who is not familiar with this process may refer to a paper by Pocklington in Pharm. Journ. April 13, 1872. 822.
[1451] Giles, Pharm. Journ. xi. (1851) 107.
[1452] Bentham unites this plant with L. Scariola L., but in most works on botany they are maintained as distinct species.
[1453] The term Thridace is also applied to Extract of Lettuce.
[1454] The authors of the French Codex of 1866 name as the source of lactucarium that form of the garden lettuce which has been called by DeCandolle Lactuca capitata. Maisch has obtained lactucarium from L. elongata Mühl. (Am. Journ. of Pharm. 1869. 148).
[1455] Inquiry into the comparative effects of the Opium officinarum, extracted from the Papaver somniferum or White Poppy of Linnæus, and that procured from the Lactuca sativa or Common cultivated Lettuce of the same author.—Transact. of the American Philosophical Society, iv. (1799) 387.
[1456] Comptes Rendus, xv. (1842) 923.
[1457] Beautifully delineated by Hanstein in the work referred to at p. 352, note 2; see also Trécul, Ann. des Sciences nat. Bot. v. (1866) 69; Dippel, Entstehung der Milchsaftgefässe, Rotterdam, 1865. tab. 1. fig. 17.